What you currently have on is fine for leveling and doing little stuff like Dl/ZS/HoS where you'll outlevel the bosses by a bunch, but you're going to want to replace most of your gears, but we all have to do that, so don't feel bad. Disclaimer: I am not a Knight, and I don't pretend to know much about how knights gear, but here's some general info.
Actual Knights will be able to give you direction on what sets you want to go for. Ardmond is probably a good way to go, since GCH gear is good and should be fairly inexpensive. Beast Man could be good too, and I am fairly sure you want to keep your Dilany ring and get the memento accessory set from the ToSH/Redhill codex people.
The Yawaka Guard will do for the time being, otherwise I think you should be on the lookout for a ToSH hammer or one-handed sword. My guys are using the ToSH hammer at the moment, and it drops a lot. Start saving for tier stones, t9 is about as low as you want to go.
The biggest nooby mistake you want to avoid is going cheap on stats. Once you get gear that will be endgame, stuff you want to keep for a while, become super-picky about how you stat. Stam, def, hp, pattack. Maybe one strength. No more mdefs, no more wis, no more dex. Consult with real endgame tanks and find a modding build you like and stick with it. You will take longer to get geared, but it will save you money in the long run. If you're gonna do it, do it right. That's good advice for pretty much all classes. As you level, stat with whatever is cheap and will help you. Once you get serious, GET SERIOUS.
Being a tank is a pretty thankless job in a party. Look for a good mentor to help you learn your role in a party well. As a tank, the life of everyone in your party is in your hands, so put as much effort into learning tanking as you put into your gear, and people will love you for it.